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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414ca79686d7e2ecdf3ef547a847c3fc351de9115f96bdeed07c345fbc7facf7' 
  AND token = 'staw5yyD8tz/klZDwkJ7rK+A5MYDhxA84K0elhI2+q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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