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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6afcb3dc81baaec4cb004333bb982538cbf4a70f30b7e1cb068f0a3176efe443' 
  AND token = 'pA0schjzQ1BAphv20Zs3yXXaoi5Llvg2sccFuxP7f/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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