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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35d044c2a6c6d35919ae64173f1e2675e05ad7b39de6275f22d2d75bf7f986f6' 
  AND token = '8sk+b/WiTz0KM19o8reHMOf7LWA4YHOY0z/O+dH8ryw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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