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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7349a45236371d4a35d07574360ac6df30bc292fb05cb322e6057f3bf62667' 
  AND token = 'tS6gYxowwjsaaLnvKZOJB/kcSgQMK7XobTeMxNaS+nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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