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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4bc3c43c35f55c8bfc550c9c795ae1d2c421cf21797d9c036966dd384b75378' 
  AND token = 'm57l7txc1igUwt6kCmeMZg91TVhNv6dOnJrtVlC6hM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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