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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01faae3b6a51a9d2f7f2d097fe6d58206ad573fd52da1b2607c0501fba3b5457' 
  AND token = '9aTOSfqWRWjdrdUK082t94thiHWTk8P0yvmIMfv83uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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