SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e236ada9697004e803e0180ec23eb9612d88b4f3584ff151cea2fd3deb87db7' 
  AND token = 'uBzbe6G6K11LfnfDdOoi/OPK1nEqLQ3RwnhbIByyBxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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