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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4bd0af3bdc2bafe87eceebe8954a49f0e759425839975a4634b41a49e2ada3d' 
  AND token = 'vs7+hL0SWotmuQzi58SgrijRrqd4OpYzlsIpNJ7+N+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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