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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c402b891c56ae1b1c2093729d4e9bd27f54bf4d166027a37bf6da0616bb6c74e' 
  AND token = 'pZxsudZy+52Khdg6ui7i2ml5d52XkZ7WsKKdhWaZU0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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