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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9d66492fdcd43884cb7bef6041d35972874a1c4e6741f8a95ecf5bbe1a69b7' 
  AND token = 'g5YuAFW5VnPnIyUP/WaREbj5eiNHarwsGfiAAKOcuYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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