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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd579e589f413c47735125b6fbb2afd6f7fe3426ad6b80eb7fbe3981430a0e72' 
  AND token = '9hDKC4B/fuKz8sQjyTb9Ix3QyXtW7he+Hfb6gVd2KbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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