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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa17629a3732e56e70ded6df62acb75af72e55f7f15516c8883d8d09739fd21' 
  AND token = 'FZ4q8X09yzrkx/fLebPI5cy7ANcNZPNu6goalqCmZqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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