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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5bc7470e05121939740817e0aff6727816f4ed08228c054e336dd4ea5345da5' 
  AND token = 'P+GmPEPi2V0bfuURNTL5ATL/xnU0DkY5JG1MfshqAoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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