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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65d2653e18ddd290c6240764d1a7be708bf4a2cda3674cb1a10fbda293ba356e' 
  AND token = 'Io4TONbftZGCMsaatbm5Nt9e8TZmLJU/OChpQPCF+6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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