SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf0c927e8d54b46f0273db9afac425aefc34f89b50667ffa70287112fbd929b' 
  AND token = 'bMVXF0D+pZyjofbCIqvYP6aal/YNsK7DMshvHKEobqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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