SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b182933b4eaea18fbe5c272f8f5c9bf1f5d8c9ca795b27836e932b8e1a93be' 
  AND token = 'XClLXEHPgbPH2xYoq6NPYLuO9jRLQ2B+wLnVoOsEGZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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