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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bcf97a02f24d87f44ebf3ae958e5046411e39550a5b1560f3faf74ccd6b73c' 
  AND token = 'MwQbHUyWXl/STjWDGhvAQtPlnOtlF6MjausHTj7C67Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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