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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971cd83b16cb7e7253d6405921625dcbe8c9dc0f6b67b7815fffb84c9b7260b9' 
  AND token = 'LyB/qwHh0pFNIryXfx0E7tq4PX8RkEvatfU38y4rqN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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