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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6e88f6b7edc342324de7c1c8291062c794845a4107ba77417a8e9bed2b074f' 
  AND token = 'WlElPeqG9LAS/Up5gxhGq7oiUCZ7tPE9IN+i51D0H3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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