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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa802a9f38363d08db6cf076ab3c8a04d413e22ce67cd2ef90546a15a7c0784' 
  AND token = 'Es4tca6+tVUl962/KzPt+k/t71H4LYQZbulIdhUDezE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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