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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44fe34c1bae04e799e21c5e0d1ed888b6e7b0c5c1fadc51d45b2ff6feaec6ab' 
  AND token = 'yCbIpF4RK0ZZ78R24pL/0b1pMW2C9xszyFntezpP1HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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