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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1361ec75f799f6a2f9f47a6b9cfa2fc5ed8eb7fed66851590ae13f8d50f1865c' 
  AND token = 'ChiYEKtRm7Tzzq1IFUAHjdsrPs/nF7Papk9B7PDJSWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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