SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c9633fcb9d0508e6babd1ff5e22954abf1632885478b65d2f8e95db27b7281' 
  AND token = 'yn/LH+seDDZztSofVeUmvK1McgzklgYhKfqgrgTjRMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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