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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b8d869842c8f3b59b070a4b4f3835dd1ae3a621e596e6fa16772886a3d6313' 
  AND token = 'Sp0yup/iWJwd5+LuCakgBy8E0QDpH78WaK1NeRlK51I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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