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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5650e97368a1def706a493c45c761b8c5e0b15dc9b1d09d235035eda209947' 
  AND token = 'PORHUUUNJEkflnysLvEqeYEcypJoyoP0Zp5qNBt4tU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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