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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d8b7cd26fd36f049b259e721bad858e26f4722d76349ece9ccb37bc7c925a5' 
  AND token = 'YrfbtfjkXs9LAPznx9RlD89qd9GN7xE842RY5AOgWaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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