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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d998142e991c9f52ea71e815e139935187d2daf77f108888314ab0e456dd967' 
  AND token = '+rGc/1Jdiekbrg/EbXf7fwsjArdzDC7Q+8Ly1OGVxs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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