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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0e303c13a1bb4df3f421672f631e22dda15a21298daa0cfedf302e4cd0900e' 
  AND token = 'CtrGIxdo7hVckYr2Y7B2sfwN/LAzG+ghX+MxsSsMryE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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