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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c939c57fb2ff10099c5d5eee14156620beed678a21036f83d42ceff0e02611' 
  AND token = 'WVrSmKZQ3eXzVG0T+yzDDiKsomc6hne0Z4yrf6RD+4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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