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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0a04fdc8b3d77e54e5a379f83abcdba1fb09eb2d9a59d4db634c6c42df3703' 
  AND token = '8BcIA02CvShl5Cwto+Q3MK938PW+9MHLvtE2Z+bfd2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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