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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0df0be7b00349b63c0113f08d7ffbe12d80d4c11b25831cb2d1688f75f8a6f' 
  AND token = '9AYhwI5zL7Vf/fSrT3Ka+fZ0ZZY4Dkzi5w10PL9+HqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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