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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63839366a4d9353fa865316ebbf65bdde9076a74e7f4c7893919062486237ac2' 
  AND token = '2cpBxtGkL2jx8P3HGNJLH+H74mNqd6RoIHW4Xc++FnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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