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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9adbf88f59ca7ae4ec249cf7c772e5c2e03a4234b7fc563d6149de558b809451' 
  AND token = 'PcTy5sZP7p2ZM20KHzER/ZV1LuSJ9IpauMW56cEmvZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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