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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19ac666f7d1f2372e854641d82fc083efe810472a24d702ce5af68d2dac3ce6' 
  AND token = 'MKsOK0JZ0LmTU+7k12AFsx9IgSxbdgJrpVXfgy6mxa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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