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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b5652efa253c5a6eb765798ccdb92a2d4bb4107c571a736777f18e958d1318' 
  AND token = 'xw2XREXHS2OEeKdowKXpAGIVUbFnLyb5Es/iIEwDJ68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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