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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61db32dba761d136d8db78180002d5c0db3e3cfaceb47af7d641877561b7e84f' 
  AND token = '9cq3axMesQW1x5rchmt+UOsldcXmS8T9AxubY3tdgqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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