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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd02e28d25c263a889042a82e4aeca012298fcf5bb56f9ed38f458d5083833d' 
  AND token = 'X83M8eezTKVwll0hle1hL7MAqwI7GYdJkr35HvVeagA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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