SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d49b88981c2449c44c30ebf608b150a9a707cf4131e77fe03af91d69095e0a2' 
  AND token = 'IKJe4V4+oRgpGZL5d61C35g6E/hujGQ9oEgDJjjm3nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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