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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79aed5a3b9fcfbf04ba9b7ad909e7048d56051ada2053a6b1748481793d0e1f' 
  AND token = '3aXcTuW1r3QktNUagQljXNIpXeVUCB+rcflh9cFg/UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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