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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70220ba0d3ddcc08c4f28203098c194131f31cfb189179823167f01db34621b4' 
  AND token = 'UbZE18ff7nkZrB9LIr+/emNclsgTDPCI7v3Ba1J/0B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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