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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1678fd2822791399c51517e9e753e10f4d97719192386f3868ac257e667e0f7b' 
  AND token = 'uXj8PDAm2BZ0iuxe2eEj4AycYE08+pxxqJPjTW8wUWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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