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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820260527e2b3d30591cd1bba5a39155b539be1476076afa2833f44a6ad95d91' 
  AND token = 'Wnvf+1pHehkNjxYfRvGnRxYN1AJ3lwHqx5rJPGSa7SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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