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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7946908002c8dcc3a20f254a3a158b43ef60524050390fd42776b5c0fc327ba1' 
  AND token = 'Ut99LLAv5QWnkAe6hjgHA2rzfwS55RYQrFgT5I0XT5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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