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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423ec898f455240ad8ef55ac61a3fb8dae0de803cca7b1f54fb694812b7ba9cc' 
  AND token = 'FqfD6lIkrgsqQjI6P9blRu7k0R5jOv0QLrOVD6HOs3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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