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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d85b3ffb75e184e04a46a27ce6d43e9b7a4adb302f5ebd3734ea65a9da4048' 
  AND token = 'a9q53A2lz9rZaGDpBDpN+3GUPqei146IYDjh5GU1b+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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