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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9ef28aa3663a15664623b41b80ed0d2e9059a33134da9ffeef4ac5ca611637' 
  AND token = 'n0JW4xVwhxo8sNHuS34hLjJkb0K5VYEgyWfgDrNs6gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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