SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01af829b3a32c1b3c13f537c0797e1cc59dd62f1956763a2b99b567d05b64f1a' 
  AND token = 'PkrYh0gp8uOjViclbQDJZkoWf/iBSU3Vdsx8xuDgxLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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