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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de2d7ce4f2599601a72c730ac77de5de81ddbe3cf930eb561085e9d3ab28421d' 
  AND token = '0D8UH3PvJaHGT0hvDMVctqG/9uWxQtLJPB7iNIxCYT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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