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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ab78164e6416694acf2a636a697f07385aee287493e9712476bbd3bd715ee8' 
  AND token = 'P26k6Gxp9NcLQ0QW6tm6czFyz4H7guf4Y3A5Sqnf4qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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