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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dad4a551f79060b5fe2f0d1f7ac5311bc7adfe2c5e99dcd3b4da6e56d4b1c39' 
  AND token = '7eRdSxa3QpH5/wTlWZpy/WeCk2xoF6b3/dJ58MBmCO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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