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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b32434b97db3113d25c768625f7ac522398e960ba9ec214dda674a6975b0ad' 
  AND token = 'zcrJhju8Ao/FE7ioiMAngcg4siL92hsRqDrcgn/4aTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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