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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ab8e4a5ac542ee5a3d92df60f15848b2d343d074ec7cf5cc3619daf9a94f8d' 
  AND token = 'n9TYnHhBs7pJcONkBBXnprZjpCpDuXqqP0IYuOcCyQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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