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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1ac003035f889c07f3b69c191a892a7fc8d7ea1e75036242a6a7ca8ef1ce2e' 
  AND token = '6VoCrUmLTxvKUk3akPExn1HbZI4LQDFwZY8Qko7gj84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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