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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f35916dadd2ff3303c8d2ef9a8e70bd639530b7ab198314a26350698cb54ba7' 
  AND token = 'JdkATIcqztEBepc3p0bEYIoAY9Ti2m2kqC1V4uVvGxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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