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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275e292ebba69bc437a2898a748a3df102418367e89b856b14c0f341e644ea71' 
  AND token = 'AUJ6kipUFeeb9scBjNWtRtzfz9AIvxKK1x4E3Gfp7No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}