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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4971b63d62c841d0eb9e29c1e1a049382570be0a576bc62348f301f634c9333' 
  AND token = 'qtY9bVYvm6QKHmFSBKdaB17r+6A6oC7QiHOP922/DeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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