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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6de08b98dd92f45c03c603e59820105b26dec1a11274aebd739154d908734a' 
  AND token = '4j0K7DR9mzZmCXC5I0d4Hj9TerbcirO0TCEkQbVAcGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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