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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e8b80c724be351b6024de5ac5a06d85848cd0d45ff64eab654ec99260bd9cb' 
  AND token = 'hGob7PaVux80+bmyE/wOTMPhHKJ6R62tK6JkLVpo7GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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