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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a75c76db83dac9d111e51191a21abedf0833cbb683b9bed29137b3713dc04c' 
  AND token = 'meLzfc/X7+mkz7UiKoQGdUGliA9Rl0ffed5LID32tSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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