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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88dd2d96c51a86f0aa6fa1f544c67a55d68614a1080e7a99f7d9f4ddf8a1041' 
  AND token = 'Lvvsvy//pMCuX3kZYp2oxVGWIPD3aewuIGqUXcUcLGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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