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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88459b8426971941a04a39941d3cf0b4141bed4548461bd76fb184d921e93bfa' 
  AND token = '8EXLv5Jj4sV8fY+XnJzIdoI6tSmnThy39ED9uJ1Q1xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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