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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d6e5e03bbe0c297858228ffdff6d28502109618614818b9006a1e5a33c2821' 
  AND token = 'ZjKR2rh/wBfP5PpjRGjmwZ4halQWfG4tyRwTx2bm+lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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