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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3628e3bba0c54e72a22b604b5653634e04a8e3b5e7e9e8e4789fc3018cedad92' 
  AND token = 'bUI/4h0sxZBJ7XuD9hlxhfQXyuEQSQw73kpoHPXjKoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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