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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0fc977c1208c345f3a17f6e6e9a32e4aa355d4523a3d220e261cf70c429ce6' 
  AND token = 'mBiF//lZ0oYxK/UwD8k28ab8GkE8cQ97rqM49m/7ugI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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