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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13761a246118eba248de4cbb8ad7a6e2ab44394a15dd501a02796dc2debe432' 
  AND token = 'lv0C/OA41t7Bz4Revq6eicymJp86nXLv1H6GQZYlzO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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